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VulnerabilityPublished

CVE-2026-48777: gtsteffaniak filebrowser · Path Traversal

Affects gtsteffaniak filebrowserSource CVE Database V5

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Mentioned vulnerabilities

Not known to be exploited · CVSS 9.3 Critical : upgrade to 1.4.2-beta or 1.3.3-stable as a priority.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.4.2-beta, 1.3.3-stable, 1.4.2 +1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade filebrowser to 1.4.2-beta or 1.3.3-stable; gtsteffaniak/filebrowser to 1.4.2 or 1.3.3.

Affected software

ProductAffectedFixed in
gtsteffaniakfilebrowserAffected
  • >=1.4.0-beta <1.4.2-beta
Fixed in
  • 1.4.2-beta
gtsteffaniakfilebrowserAffected
  • <1.3.3-stable
Fixed in
  • 1.3.3-stable
GitHubgtsteffaniak/filebrowserpkg:github/gtsteffaniak/filebrowserOther threatsAffected
  • <1.3.3
  • <1.4.2
Fixed in
  • 1.3.3
  • 1.4.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability has been fixed in versions 1.3.3-stable and 1.4.2-beta of filebrowser. Users should upgrade to these or later versions to remediate the issue. Since this is a self-hosted product, patching is the primary mitigation. No vendor advisory content contradicts this; therefore, upgrading is the recommended action.

Description

CVE-2026-48777 is a critical path traversal vulnerability in the gtsteffaniak filebrowser product, specifically affecting versions prior to 1.3.3-stable and 1.4.2-beta. The flaw exists in the publicPatchHandler endpoint, where user-controlled path inputs are joined with a trusted base path before sanitization, allowing traversal outside the intended directory. This enables an attacker with a public share link that has AllowModify=true to move, copy, or rename arbitrary files within the share owner's root directory. The issue was fixed in versions 1.3.3-stable and 1.4.2-beta.

References

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